The desmos calculator is great! And very much in line with what I would want to do. Maybe it's just me being shy to approach someone on the project or the stupid "I want to do it myself" but I haven't tried to join any existing project. I always blame myself for not joining sympy back in the day when Ondřej Čertík first created it. GNU Octave is going in a slightly different direction, I wouldn't even know where to start. Thanks :)